Lwco Feeds water at power on

Firstlook

Just replaced lwco to new McDonnell miller pse-802-24 lwco feeds water at power on . Old lwco did not.

Jamie Hall

Different control logic. After a power cycle, does it operate correctly?

Firstlook

it does the problem being if we get brown

Outs it floods boiler as each power on feeds water for about 30 sec and you can see the problem.

Lance

Ahh, controls. They give us many options but who is wise enough to apply the correct part to match the application? In science the quest for better things, funded by profit and the problem solution quest, we have all too often changed something and then have another problem. Often it is the result of, as they say in congress, (the fault of unintended consequences, but not me". But who thinks about frequent power outages causing a problem that a normal float control could care less about. Oh, the sharp ones, who learned to think and get wiser. That's what's great about this site. We are full of wisdom and the reasons why.

Anyway, some controls are designed to perform an operational check when powered on. The on/off check. But this is not for every application. Especially if this control remains unpowered during thermostat cycling like what happens with a line voltage thermostat wired system.

Also for steam water refill, some applications have feed issues. If water pressure is too high and the pipe flow too great we can get weird results. Just like if flow is too slow, we can get burner shutoff before refilling is accomplished which screws up a perfectly good steaming cycle.

But we also know that what appears to be caused by a new change is not the change but the attention to another problem that was hidden or ignored. But that's what the diagnostician gets paid for.

Imagine the owner, constantly turning power on and off to start it, not realizing feeding water each time.

Often its the oil burner, won't start, but upon each try the customer pumps oil into the chamber. When I get there, if I don't burn off that fuel, I'll get too much fire, soot and smoke.